section{
    border: 2px;
    border-style: dotted;
}
.beijing{
    line-height: 700px;
    text-align: center;
    height: 700px;
    width: 100%;
    background-image: url("images/安全产品背景.jpg");
}
.beijing h2{
    color:white;
    font-size: 60px;
    font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
}
.intro{
    background-color: rgb(200, 200, 215);
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.intro b{
    font-size: 30px;
}
.first{
    text-align: center;
    background-color: rgb(171, 199, 236);
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-style: italic;
    font-family: Georgia, 'Times New Roman', Times, serif;
}
.second{
    display:flex;
    background-color: rgb(175, 187, 203);
    justify-content: space-between;
    align-items: center;
    padding: 100px 180px 80px;
}
.second img{
    width:300px;
    height:300px;
    border-radius: 10px;
}
.second div{
    width:300px;
    text-align: center;
}
.second h3{
    font-size: 15px;
    margin: 20px 0; 
}
.second p{
    font-size: 14px;
    line-height: 2em;
}
footer{
    background-color: #000000;
    color: #b7b7b7;
    height:60px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 14px;
}